Upgrade paritytech/srtool version to 1.70.0 (#473)

Author: imstar15

.github/workflows/release.yml

@@ -50,7 +50,7 @@ jobs:
         uses: chevdor/srtool-actions@v0.5.0
         with:
           chain: ${{ matrix.chain }}
-          tag: 1.66.1
+          tag: 1.70.0
       - name: Summary
         run: |
           echo '${{ steps.srtool_build.outputs.json }}' | jq . > ${{ matrix.chain }}-srtool-digest.json